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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcbce71c359e07a5e29ef2597d6bcbfcad761ec8c3b3f32983053ac71111f5c' 
  AND token = 'PSi5V+w61aHHDmh0tDyRU+3EjjO1B0eYyhoMRM5i6qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}